fbdev: Fix unregistering of framebuffers without device
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.17.3 by commit feed87ff122b1640c221d4dd559442ab2cd50bb1, it was introduced in version v5.17.2 by commit 4d695d7c276f15adb1d2b64c584c3cf8f4f9e9ce. For more details please see the references link.